Feel free to ______the engineer for more assistance.A、call onB、call toC、call f

游客2025-06-19  1

问题 Feel free to ______the engineer for more assistance.

选项 A、call on
B、call to
C、call forward
D、call at

答案 A

解析 To call on means to request or visit. Choice (B) means to get someone’s attention by shouting to them. Choices (C) and (D) are not two-word verbs.  
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